/*
XPTracker - Alternative Agile Tracking Tool
Copyright (C) 2006-2009  Stephen Starkey

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
*/
package org.xptracker.util;

import com.mdimension.jchronic.Chronic;
import com.mdimension.jchronic.utils.Span;

import java.text.DateFormat;
import java.text.FieldPosition;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Date;

public class ChronicDateFormat extends DateFormat {
  private SimpleDateFormat outFormat;

  public ChronicDateFormat(String outFormat) {
    this.outFormat = new SimpleDateFormat(outFormat);
  }

  public StringBuffer format(Date date, StringBuffer toAppendTo, FieldPosition fieldPosition) {
    return outFormat.format(date, toAppendTo, fieldPosition);
  }

  public Date parse(String source, ParsePosition pos) {
    Span span = Chronic.parse(source);
    if (span != null && span.isSingularity()) {
      pos.setIndex(source.length());
      pos.setErrorIndex(0);
      return span.getEndCalendar().getTime();
    }
    return null;
  }
}
